Ribbon-feed mechanism for type-writers.



No. 884,691. PATENTED APR. 14, 1908. J. VULKEE.

RIBBON F EED MECHANISM FOR TYPE WRITERS. APPLIOATION FILED FEB.12,1906'.

2 SHEETS-SHEE'L 1.

7 -1 bun/u -PATENTE,D'APR; 14, 1908.

- 220 125? 2 Jam WW? Z ywmg J VULKER RIBBON FEED MEGHANISMFORTYPEWRITBRS.

APPLICATION FILED FEB 12, 1906 I N a? x Z &

w g Pg Is I ' each forward step of the carriage.

UNITED sTA'rns Pr-{TENT onnron.

JEAN voLKER, or NEU IsENBURc, GERMANY, ASSIGNOR 'ro THE FIRM or PETERWEIL & 00., or RODELHEIM, NEAR FRANnroar-oN-rnE-MAIN, GERMANY.

RIBBON-FEED MECHANISM FOR TYPE-WRITERS.

Specification of Letters Patent.

Patented April 14, 1908.

Application filed February 12, 1906. Serial No. 300,676.

lating to Ribbon-Feed Mechanism for Type v Writers, of which thefollowing is a specifica- 'tion.

This invention relates to ribbon-feed mechanism for type writingmachines by which the rotary movement of the spring-barrel indirectlyimparts motion to the ribbon during The improved mechanism differs fromprevious mechanisms of this'kind in so fanthat it translates the rotarymotion of the spring barrel into oscillatory motion for two pushrodsprovided with double clawkers adapted to impart motion to theratchet-wheels keyed on the shafts of the ribbon-spools.

In order to render the invention clear, I will describe the same withreference to the accompanying drawings, in which:

Figure 1 is a plan of the improved intermediate mechanism fortransmitting the motion. Fig. 2 is a side-view of the ratchet of one ofthe ribbon-spools showing the clawkers disengaged. Fig. 3 is'a similarview of the ratchet with the clawkers in engagement. Fig. 4 is a frontview ofthe reversing bar and showing the push-rods in section. Fig. ,5is a perspective view of the complete mechanism. Fig. 6 shows the springbarrel and "connected parts in operative positions during the forwardmovement of the carriage. Fig.

7 shows the same parts in their inoperative positions during the returntravel ofthe carriage.

According to my invention I provide the rearside of the spring barrel mof the machine with teeth a rising at their inner sides towards thebarrel shaft as is clearly shown in Fig. 5, the teeth being of agenerally inverted V formation with rounded ridge. A lever 8 fast on ashaft t is arranged to reach with its free end as far as thetooth n andhas a short "bend v by which it carries a pawl 0 whose motion is limitedtowards the rear by Ia stop 19 resting against theedge of the end *0.The free end of the pawl o is furmounted a spring r so constituted astopress the stop 19 against the end'c of the lever s. On the shaft 25 isfixed a short arm held by a tension spring a which is attached to arigidpart of the machine and tends to press the lever s and its pawl 0 withroller g into the teeth a of the spring-barrel.

Presuming the spring barrel m to turn during the advance of the carriagein the direction of the arrow shown in Fig. 6, and that then the freeend of the lever s with its pawl 0 is in the dotted position, the rollerq resting in the hollow between the teeth, when the barrel turns, asstated, until the ridge of a tooth operates against the roller g andlifts the pawl'o, the stop 1) ofthe pawl o will be pressed against thecorner of the bend 'o of the lever s and the latter will thus be movedoutwards to theposition shown in full lines at Fig. 6. At thecontinuedmotion of the barrel m the roller g slides down the rear of thetooth by reason of the action of spring a. It will thus be obvious thatthe lever 8 receives oscillatory revolving barrel.

At the return travel of'the carriage, the spring barrel turns in thedirection of the arrow shown in Fig. 7 and-the pawl 0 will at firstenter the hollow of the. tooth as indicatedby dotted linesin Figs. 6'and 7 The further rotation of the barrel then causes the next tooth topress the pawl 0 rearward against the pull of its spring T but withoutlifting the lever 8, this being due to the stop 17 moving free on the,lever in the opposite direction into the position shown in full lines atFig. 7. In this casethe pawl works idle and produces no oscillatorymotion of the lever. Thelever s is situated at the side of themachine'and "has a lateral angular arms which is pivoted bya pin 0 to apush rod 7c. The rod k carries at its front end a plate 9 formed withcentral slot adapted to take round the vertical'spindle d of the ribbonspool, which spindle is fitted with a ratchet wheel bias shown. Theplate g has four lugs e to form bearingsfor pivoted clawkers f.

and j which are arranged to operate in opposite directions. 'As there isa ribbon spool at each end of the machine for the successive win'din ofthe ribbon from one on to the other,it wi l be necessary to employ asimilar ratchet mechanism for such spool.

For this purpose I prqyide a fixed lever arm motionfrom the 1o f engagesin a tooth of the ratchet h and so at the other end of the shaft t. Theleverarm 2 is connected by-a pin to a horizontal push-rod k. to whosefree end is fixed a slotted plate 9 with lugs e forming bearings forclawkers f and 'f nately made to operate the ratchetwheel h on thespindle d that. engages in the slot of These are alterthe plate g Whenthe latter is moved for ward by the'action of the lever s, the clawker 1turns the same in the direction of the arrow shown in Figs. 1 and 3,while the clawker at the other side of the ratchet passes over the tooththereof and. then drops into .the next i direction, while the clawker fmoves v-idly. .20

tooth and prevents thewhe'el tiirning backward. At'the-retreatingmovement of the, plate 9 the clawkerf.becomesoperativeand turns thewheel h still further in the same over av tooth and thendrops behind.the

" sameto stop the wheel in that direction.

The clawkers 'andf" kee .in-enga ement with -the ri tcliizt teeth bytheir. oii n weight-providing thepositions of the push rods 7c and 7callow. of it. By liftin the one or theother ofsaidro'ds; the claw erswill be heldon rests y,,-y and y, 1 respectively without touching theratchets. In this manmi and so long as theplate isin its loweredposition, the ratchet whee .71] will be conqtinuously turned in auniformdirection until. the ribbon is fully wound 'on the spool on theshaft. The end of the ink ribbon may be differently, colored or-befastened to a piece ofv different. ribbon so as to indicate when the.ribbon is unwound. When this occurs it will .belneces'sary to; reversethe movement, that is to say, the spindle d andv .ratchet wheel 7L mustbe set free while the I the ratcheth and at the same'time lower theratchet h' has to bedriven. For thispurpose itwill be required to lifttheirod g of rod k'with its late 9 on the ratchet-wheeljh. Thisisefiected by'means of a horizontal rail or bar a which is appropriatelyguided on the machine, say. by means ofslots a and pins a. Thebar aisplaced edgewi's'e and has. at, itsiuppleredge two shallowrecesses band b at suc a' distance apart asto cause one. of the push-rods,suchask, to'be in the recess 1;, while the other push-rod leis away fromits recess a. and rests on the top edge of the bar was shown in fulllines, -.or reversed as indicated by dotted lines in Fig. 4. Thus, therod k is in this position slightly lower than the rod is and'thecla'wkers f of the former are in engagement with the ratchet wheel,while the clawkers f and f are disen graged. The bar a canbe shiftedendwise om-one position to another by means of a small handle a: at thefront of the machine giving motion to such bar a through a rod i andcrank arm w with slot and pin connec'- tion asshown, Thus the; ositionofthe handle :0 indicates the direction of travel of the ribbon and needyonly be turned sidewise at the proper moment order to reverse themovements ti6n,gwha't l claim'and desire to secure by Letters Patentis:1

L'In a typewritenthe combination with the spring barrel ofinvertedV-shaped teeth barrel, ofaispring controlled leverkjeyed chineframe work-,the said lever cooperating with the teeth of thespring'barrel with the intermediary-of an antifrictionroller, means ,forpreventing the lever frombeing operated Iwhenthe spring barrel rotatesbackward and meansfor converting the oscillatory motion described. l

the-spring barrel of teeth arranged onthe backside of the latter, of aspring controlledlever keyed upon-an oscillating shaft, ofa bent'partarranged on theupper'end of the lever, 'a spring controlled pawlpivotally connected to the said bent'part, an antifriction roller,carried on one end of the pawl and cobarrel, a stop on -the opposite endof the said pawl which normally rests against the said bent partand isadapted to cause the said the oscillating motion of the said lever tothe ribbon spool spindles in the form of a rotary motionysubstantiallyas and for the purpose described. I 3.. In a typewriter the combinationwith a springbarre of teeth arranged on the rear side of the latter,-'ofaspri controlled lever ing rods in and out of gear, substantia ly as andfor the purpose set forth.

spring barre of teeth arranged on therear side of the latter, of a sprincontrolled lever oscillated by the-said teet an oscillating shaftcarryin the said lever, arms secured one to the said lever and the otherto the said shaft on the opposite side of the machine, horizontalpush-rods articulated to the said arms and carrying attheir free'endsslotted Having. now fully described said invdn 'forrned'with a broadbase-.and a rounded ridge andarranged on the back side of the 2. In atypewriter the combinationwith operating with the teeth of 'the'saidspring leverto oscillate during the forward traveli only .of the barrel,means for transmitting oscillated by the said 'teet an oscillating.

lever and the other to the said for alternately'throwing' one of thesaid ush 4. In a ty ewriter the combinationwitha upon a shaftpivotallysecured tothe ma of the said lever into arotary motion andtransmittingthe latter to the. ribbon spool spindles substant ally asand for the purpose plates en aging the vertical ribbon spoolspindles, cawkers oppositely arranged on the said plates and adapted to rotate ateach motion of the push rods, horizontal ratchet wheels keyed upon theribbon spool spindles,-

rests for the clawkers when inoperative, and

"shaft on the opposite side of the machine,

horizontal push rods articulated to thesaid arms and carrying at theirfree ends slotted plates en aging the "vertical ribbon spool spindles, cawkers'oppositely arranged on the said plates and adapted to-rotate ateach motion of the push' rods, horizontal ratchet wheels keyed upon theribbon spool spindles,

rests for the clawkers when inoperative, a hand operated slide barguided on the ma chine transversely to the said push-rods and adapted tosupport the latter on itsupper edge,- shallow recesses arranged in thesaid upper edge of the bar and so distributed as to cause one of thepush rodsto be in its recess while the other push rod rests on the plainedge of the bar, substantially as and for the purpose described.

6. In a typewriting machine the combination of a spring barrel providedwith. teeth and'adapted to rotate in reverse directions, ribbon spoolspindles provided with ratchet v teeth, .rods' provided with pawlsadapted to engage said teeth, means for throwing one of 40 said'rods andits pawls out of operative relaft tion with its' spindle, said meansthrowing.

the remaining rod and its pawl into operative relation with its;spindle, levers connpced sen i a e a,

t err aean connected with one of said levers and adapted to have rigidand yielding engagement-there'- with whereb rotation of said barrel inone direction w l serve ;to operate said lever through said rigidconnection, said yielding cptnnection permitting said dog to operate 1iln a typewriting machine the combma'; tion of a spring. barrelprovidedwith teeth and ada ted to be rotated in reverse directions,ribbon spool spindles rovided with ratchet teeth, rods provide withpawls adapted to engage said teeth, lev'ers 0011- I nected with saidrods, and a spring actuated dog connected with one of said levers'and.

adapted to have rigid and, yielding engagement therewith whencooperating withsaid spring barrel whereby-rotation of said barrel inone direction will serve to operatev said -levers through said rigidconnection, said yielding connection permitting said dog to operate idlyvhen said barrel is rotated inan opposite direction.

8. In a typewriting machine the combinaand adapted to be rotated inreverse directions, ribbondslpool spindles, means for rotat mg said 5 ines, and a spring actuated dog 'tion of a spring barrel'provided withteeth associate with said means and adapted for engagementwiththe teethof said barrel, said .dog having a rigid and yielding" engagement withsaidme'ans whereby rotationof said barrel in one direction will serve too erate said means through, said dog and rigi con: nection, saidyielding connection-permitting said dog to operate idly during rotationof said barrel in an opposite direction.

In testimony, I have hereunto set my handin presence of two witnesses-.-

- ,voLKn'nr Witnesses 2 JEAN Gnome, CARL GBUND'.T

